Concrete Math – Like in Your Driveway

They poured my new driveway yesterday. We ate breakfast and watched as they worked.

And we witnessed an amazing feat of engineering.

A tiny twist is all it takes!

I was watching one of the workers smooth the concrete. He was using a bull float:

I noticed he was twisting the handle as he worked. On closer inspection, I saw the engineering of the device:

And here’s the other side:

As the worker twisted the handle, it would change the angle of the surface of the bull float. This prevented him from having to change the angle of the handle. Like this:

Watch it in action:

Oh, yeah – those angles and changing the of length of the chain… That’s Math!

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